Other than the Google+ post and a YouTube video, Google isn't revealing a lot of information about Project Glass - stating that the firm was only revealing the project "because we want to start a conversation and learn from your valuable input."

The revealed slender glasses themselves appear to project a visual HUD into the user's field of vision. The video shows various Google services such as calendars, maps navigation and communication tasks through the first-person viewpoint of the protagonist.

Voice recognition appears key with the star of the video issuing such commands as "remind me to buy a ticket for Monsieur Gayno tonight" after seeing a poster advertising the musician.